kivy/examples/widgets/scrollview.kv

#:kivy 1.0.4
<ScrollView>:
    canvas:
        Color:
            rgb: 1, 0, 0
        Rectangle:
            pos: self.pos
            size: self.size

<GridLayout>:
    canvas:
        Color:
            rgb: 1, 1, 0
        Rectangle:
            pos: self.pos
            size: self.size